How to Propagate Portugese viperina?
Propagate by seed sown at 13-16°C in summer, overwintering seedlings at 5-7°C

Portugese viperina · Echium tuberculatum
Grow in moderately fertile, freely-draining soil in a sheltered, sunny, warm site. Protect from winter frosts in-situ using horticultural fleece
Propagate by seed sown at 13-16°C in summer, overwintering seedlings at 5-7°C